An experiment consisting of a polydisperse population of glass spheres, with a mean diameter of 30 mu m, falling through the shear layer of a developing plane turbulent jet is reported. The aim is to provide robust data to validate existing and future Eulerian models of multiphase flow. The Reynolds number of the flow is approximate to 20, 000, and the mean diameter of the glass particles coupled with the integral scale of this flow result in a Stokes number of 1. The measurement locations are within regions of two-way coupled flow. The measurements were obtained using laser and phase Doppler anemometry, and large sample counts were employed to ensure good statistical accuracy of higher-order moments. Single phase measurements reveal the turbulence characteristics are similar to other published work. An assessment is made of the conservation properties of the particle phase, which reveals the accuracy of the mass flux distribution to be typical of the phase Doppler anemometry method. The results show that the particle plume is "winnowed", and this permits the analysis of interphase transfer teens specific to different diameter distributions, to assess the accuracy of approximations published elsewhere. It is found that the accuracy of mean interphase transfer estimates, averaged over all particle diameters, provides poor accuracy, and some cases incorrect direction as well as magnitude. m